nixpkgs/pkgs/development/compilers/openjdk-darwin/default.nix

{stdenv, fetchurl, ...}:
let
jdk = stdenv.mkDerivation {
    name = "openjdk6-b16-24_apr_2009-r1";

    src = fetchurl {
      url = http://hg.bikemonkey.org/archive/openjdk6_darwin/openjdk6-b16-24_apr_2009-r1.tar.bz2;
      sha256 = "14pbv6jjk95k7hbgiwyvjdjv8pccm7m8a130k0q7mjssf4qmpx1v";
    };

    installPhase = ''
      mkdir -p $out
      cp -vR * $out/
    '';

    passthru.jre = jdk;

  };
in jdk